<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
  <script>

    var obj = {
      name: "why",
      age: 18,
      height: 1.88
    }

    // Object.defineProperty(obj, "name", {})
    // Object.defineProperty(obj, "age", {})
    // Object.defineProperty(obj, "height", {})

    // 新增的方法
    Object.defineProperties(obj, {
      name: {
        configurable: true,
        enumerable: true,
        writable: false
      },
      age: {
      },
      height: {
      }
    })

  </script>

</body>
</html>